msg.c revision 7945c1fb02ef08316df8c054ce180bf3f4e35ae4
1/* 2 * net/tipc/msg.c: TIPC message header routines 3 * 4 * Copyright (c) 2000-2006, Ericsson AB 5 * Copyright (c) 2005, 2010-2011, Wind River Systems 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the names of the copyright holders nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * Alternatively, this software may be distributed under the terms of the 21 * GNU General Public License ("GPL") version 2 as published by the Free 22 * Software Foundation. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37#include "core.h" 38#include "msg.h" 39 40u32 tipc_msg_tot_importance(struct tipc_msg *m) 41{ 42 if (likely(msg_isdata(m))) { 43 if (likely(msg_orignode(m) == tipc_own_addr)) 44 return msg_importance(m); 45 return msg_importance(m) + 4; 46 } 47 if ((msg_user(m) == MSG_FRAGMENTER) && 48 (msg_type(m) == FIRST_FRAGMENT)) 49 return msg_importance(msg_get_wrapped(m)); 50 return msg_importance(m); 51} 52 53 54void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, 55 u32 hsize, u32 destnode) 56{ 57 memset(m, 0, hsize); 58 msg_set_version(m); 59 msg_set_user(m, user); 60 msg_set_hdr_sz(m, hsize); 61 msg_set_size(m, hsize); 62 msg_set_prevnode(m, tipc_own_addr); 63 msg_set_type(m, type); 64 if (!msg_short(m)) { 65 msg_set_orignode(m, tipc_own_addr); 66 msg_set_destnode(m, destnode); 67 } 68} 69 70/** 71 * tipc_msg_calc_data_size - determine total data size for message 72 */ 73 74int tipc_msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect) 75{ 76 int dsz = 0; 77 int i; 78 79 for (i = 0; i < num_sect; i++) 80 dsz += msg_sect[i].iov_len; 81 return dsz; 82} 83 84/** 85 * tipc_msg_build - create message using specified header and data 86 * 87 * Note: Caller must not hold any locks in case copy_from_user() is interrupted! 88 * 89 * Returns message data size or errno 90 */ 91 92int tipc_msg_build(struct tipc_msg *hdr, 93 struct iovec const *msg_sect, u32 num_sect, 94 int max_size, int usrmem, struct sk_buff **buf) 95{ 96 int dsz, sz, hsz, pos, res, cnt; 97 98 dsz = tipc_msg_calc_data_size(msg_sect, num_sect); 99 if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) { 100 *buf = NULL; 101 return -EINVAL; 102 } 103 104 pos = hsz = msg_hdr_sz(hdr); 105 sz = hsz + dsz; 106 msg_set_size(hdr, sz); 107 if (unlikely(sz > max_size)) { 108 *buf = NULL; 109 return dsz; 110 } 111 112 *buf = tipc_buf_acquire(sz); 113 if (!(*buf)) 114 return -ENOMEM; 115 skb_copy_to_linear_data(*buf, hdr, hsz); 116 for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) { 117 if (likely(usrmem)) 118 res = !copy_from_user((*buf)->data + pos, 119 msg_sect[cnt].iov_base, 120 msg_sect[cnt].iov_len); 121 else 122 skb_copy_to_linear_data_offset(*buf, pos, 123 msg_sect[cnt].iov_base, 124 msg_sect[cnt].iov_len); 125 pos += msg_sect[cnt].iov_len; 126 } 127 if (likely(res)) 128 return dsz; 129 130 buf_discard(*buf); 131 *buf = NULL; 132 return -EFAULT; 133} 134 135#ifdef CONFIG_TIPC_DEBUG 136 137void tipc_msg_dbg(struct print_buf *buf, struct tipc_msg *msg, const char *str) 138{ 139 u32 usr = msg_user(msg); 140 tipc_printf(buf, KERN_DEBUG); 141 tipc_printf(buf, str); 142 143 switch (usr) { 144 case MSG_BUNDLER: 145 tipc_printf(buf, "BNDL::"); 146 tipc_printf(buf, "MSGS(%u):", msg_msgcnt(msg)); 147 break; 148 case BCAST_PROTOCOL: 149 tipc_printf(buf, "BCASTP::"); 150 break; 151 case MSG_FRAGMENTER: 152 tipc_printf(buf, "FRAGM::"); 153 switch (msg_type(msg)) { 154 case FIRST_FRAGMENT: 155 tipc_printf(buf, "FIRST:"); 156 break; 157 case FRAGMENT: 158 tipc_printf(buf, "BODY:"); 159 break; 160 case LAST_FRAGMENT: 161 tipc_printf(buf, "LAST:"); 162 break; 163 default: 164 tipc_printf(buf, "UNKNOWN:%x", msg_type(msg)); 165 166 } 167 tipc_printf(buf, "NO(%u/%u):", msg_long_msgno(msg), 168 msg_fragm_no(msg)); 169 break; 170 case TIPC_LOW_IMPORTANCE: 171 case TIPC_MEDIUM_IMPORTANCE: 172 case TIPC_HIGH_IMPORTANCE: 173 case TIPC_CRITICAL_IMPORTANCE: 174 tipc_printf(buf, "DAT%u:", msg_user(msg)); 175 if (msg_short(msg)) { 176 tipc_printf(buf, "CON:"); 177 break; 178 } 179 switch (msg_type(msg)) { 180 case TIPC_CONN_MSG: 181 tipc_printf(buf, "CON:"); 182 break; 183 case TIPC_MCAST_MSG: 184 tipc_printf(buf, "MCST:"); 185 break; 186 case TIPC_NAMED_MSG: 187 tipc_printf(buf, "NAM:"); 188 break; 189 case TIPC_DIRECT_MSG: 190 tipc_printf(buf, "DIR:"); 191 break; 192 default: 193 tipc_printf(buf, "UNKNOWN TYPE %u", msg_type(msg)); 194 } 195 if (msg_routed(msg) && !msg_non_seq(msg)) 196 tipc_printf(buf, "ROUT:"); 197 if (msg_reroute_cnt(msg)) 198 tipc_printf(buf, "REROUTED(%u):", 199 msg_reroute_cnt(msg)); 200 break; 201 case NAME_DISTRIBUTOR: 202 tipc_printf(buf, "NMD::"); 203 switch (msg_type(msg)) { 204 case PUBLICATION: 205 tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20); /* Items */ 206 break; 207 case WITHDRAWAL: 208 tipc_printf(buf, "WDRW:"); 209 break; 210 default: 211 tipc_printf(buf, "UNKNOWN:%x", msg_type(msg)); 212 } 213 if (msg_routed(msg)) 214 tipc_printf(buf, "ROUT:"); 215 if (msg_reroute_cnt(msg)) 216 tipc_printf(buf, "REROUTED(%u):", 217 msg_reroute_cnt(msg)); 218 break; 219 case CONN_MANAGER: 220 tipc_printf(buf, "CONN_MNG:"); 221 switch (msg_type(msg)) { 222 case CONN_PROBE: 223 tipc_printf(buf, "PROBE:"); 224 break; 225 case CONN_PROBE_REPLY: 226 tipc_printf(buf, "PROBE_REPLY:"); 227 break; 228 case CONN_ACK: 229 tipc_printf(buf, "CONN_ACK:"); 230 tipc_printf(buf, "ACK(%u):", msg_msgcnt(msg)); 231 break; 232 default: 233 tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg)); 234 } 235 if (msg_routed(msg)) 236 tipc_printf(buf, "ROUT:"); 237 if (msg_reroute_cnt(msg)) 238 tipc_printf(buf, "REROUTED(%u):", msg_reroute_cnt(msg)); 239 break; 240 case LINK_PROTOCOL: 241 switch (msg_type(msg)) { 242 case STATE_MSG: 243 tipc_printf(buf, "STATE:"); 244 tipc_printf(buf, "%s:", msg_probe(msg) ? "PRB" : ""); 245 tipc_printf(buf, "NXS(%u):", msg_next_sent(msg)); 246 tipc_printf(buf, "GAP(%u):", msg_seq_gap(msg)); 247 tipc_printf(buf, "LSTBC(%u):", msg_last_bcast(msg)); 248 break; 249 case RESET_MSG: 250 tipc_printf(buf, "RESET:"); 251 if (msg_size(msg) != msg_hdr_sz(msg)) 252 tipc_printf(buf, "BEAR:%s:", msg_data(msg)); 253 break; 254 case ACTIVATE_MSG: 255 tipc_printf(buf, "ACTIVATE:"); 256 break; 257 default: 258 tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg)); 259 } 260 tipc_printf(buf, "PLANE(%c):", msg_net_plane(msg)); 261 tipc_printf(buf, "SESS(%u):", msg_session(msg)); 262 break; 263 case CHANGEOVER_PROTOCOL: 264 tipc_printf(buf, "TUNL:"); 265 switch (msg_type(msg)) { 266 case DUPLICATE_MSG: 267 tipc_printf(buf, "DUPL:"); 268 break; 269 case ORIGINAL_MSG: 270 tipc_printf(buf, "ORIG:"); 271 tipc_printf(buf, "EXP(%u)", msg_msgcnt(msg)); 272 break; 273 default: 274 tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg)); 275 } 276 break; 277 case LINK_CONFIG: 278 tipc_printf(buf, "CFG:"); 279 switch (msg_type(msg)) { 280 case DSC_REQ_MSG: 281 tipc_printf(buf, "DSC_REQ:"); 282 break; 283 case DSC_RESP_MSG: 284 tipc_printf(buf, "DSC_RESP:"); 285 break; 286 default: 287 tipc_printf(buf, "UNKNOWN TYPE:%x:", msg_type(msg)); 288 break; 289 } 290 break; 291 default: 292 tipc_printf(buf, "UNKNOWN USER:"); 293 } 294 295 switch (usr) { 296 case CONN_MANAGER: 297 case TIPC_LOW_IMPORTANCE: 298 case TIPC_MEDIUM_IMPORTANCE: 299 case TIPC_HIGH_IMPORTANCE: 300 case TIPC_CRITICAL_IMPORTANCE: 301 switch (msg_errcode(msg)) { 302 case TIPC_OK: 303 break; 304 case TIPC_ERR_NO_NAME: 305 tipc_printf(buf, "NO_NAME:"); 306 break; 307 case TIPC_ERR_NO_PORT: 308 tipc_printf(buf, "NO_PORT:"); 309 break; 310 case TIPC_ERR_NO_NODE: 311 tipc_printf(buf, "NO_PROC:"); 312 break; 313 case TIPC_ERR_OVERLOAD: 314 tipc_printf(buf, "OVERLOAD:"); 315 break; 316 case TIPC_CONN_SHUTDOWN: 317 tipc_printf(buf, "SHUTDOWN:"); 318 break; 319 default: 320 tipc_printf(buf, "UNKNOWN ERROR(%x):", 321 msg_errcode(msg)); 322 } 323 default: 324 break; 325 } 326 327 tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg)); 328 tipc_printf(buf, "SZ(%u):", msg_size(msg)); 329 tipc_printf(buf, "SQNO(%u):", msg_seqno(msg)); 330 331 if (msg_non_seq(msg)) 332 tipc_printf(buf, "NOSEQ:"); 333 else 334 tipc_printf(buf, "ACK(%u):", msg_ack(msg)); 335 tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg)); 336 tipc_printf(buf, "PRND(%x)", msg_prevnode(msg)); 337 338 if (msg_isdata(msg)) { 339 if (msg_named(msg)) { 340 tipc_printf(buf, "NTYP(%u):", msg_nametype(msg)); 341 tipc_printf(buf, "NINST(%u)", msg_nameinst(msg)); 342 } 343 } 344 345 if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) && 346 (usr != MSG_BUNDLER)) { 347 if (!msg_short(msg)) { 348 tipc_printf(buf, ":ORIG(%x:%u):", 349 msg_orignode(msg), msg_origport(msg)); 350 tipc_printf(buf, ":DEST(%x:%u):", 351 msg_destnode(msg), msg_destport(msg)); 352 } else { 353 tipc_printf(buf, ":OPRT(%u):", msg_origport(msg)); 354 tipc_printf(buf, ":DPRT(%u):", msg_destport(msg)); 355 } 356 } 357 if (msg_user(msg) == NAME_DISTRIBUTOR) { 358 tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg)); 359 tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg)); 360 } 361 362 if (msg_user(msg) == LINK_CONFIG) { 363 u32 *raw = (u32 *)msg; 364 struct tipc_media_addr *orig = (struct tipc_media_addr *)&raw[5]; 365 tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg)); 366 tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg)); 367 tipc_media_addr_printf(buf, orig); 368 } 369 if (msg_user(msg) == BCAST_PROTOCOL) { 370 tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg)); 371 tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg)); 372 } 373 tipc_printf(buf, "\n"); 374 if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg))) 375 tipc_msg_dbg(buf, msg_get_wrapped(msg), " /"); 376 if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT)) 377 tipc_msg_dbg(buf, msg_get_wrapped(msg), " /"); 378} 379 380#endif 381